/* ============================================
   AYMAN SEDDIK — PORTFOLIO STYLESHEET
   Premium developer portfolio | Vanilla CSS
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  --font-primary: 'Poppins', sans-serif;
  --font-secondary: 'Inter', sans-serif;

  --accent: #38bdf8;
  --accent-2: #6366f1;
  --accent-3: #a855f7;
  --gradient: linear-gradient(135deg, #22d3ee, #38bdf8, #6366f1, #a855f7);
  --gradient-text: linear-gradient(135deg, #22d3ee, #38bdf8, #818cf8, #c084fc);

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  --header-height: 72px;
  --container-max: 1200px;
  --section-padding: 100px;

  /* Dark theme (default) */
  --bg-primary: #0f172a;
  --bg-secondary: #111827;
  --bg-tertiary: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --glass-bg: rgba(30, 41, 59, 0.55);
  --glass-border: rgba(148, 163, 184, 0.12);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 40px rgba(56, 189, 248, 0.15);
  --nav-bg: rgba(15, 23, 42, 0.75);
  --input-bg: rgba(15, 23, 42, 0.6);
  --card-hover: rgba(56, 189, 248, 0.08);
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(148, 163, 184, 0.25);
  --shadow: 0 8px 32px rgba(15, 23, 42, 0.08);
  --shadow-glow: 0 0 40px rgba(56, 189, 248, 0.12);
  --nav-bg: rgba(255, 255, 255, 0.85);
  --input-bg: rgba(241, 245, 249, 0.9);
  --card-hover: rgba(56, 189, 248, 0.06);
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-secondary);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
  background: var(--bg-primary);
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

body.no-scroll {
  overflow: hidden;
}

body.custom-cursor {
  cursor: none;
}

body.custom-cursor a,
body.custom-cursor button {
  cursor: none;
}

main {
  position: relative;
  z-index: 1;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition);
}

ul {
  list-style: none;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

h1, h2, h3, h4 {
  font-family: var(--font-primary);
  color: var(--text-primary);
  line-height: 1.25;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- Custom Cursor ---------- */
.cursor-dot,
.cursor-outline {
  position: fixed;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 10000;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.2s, height 0.2s, background 0.2s;
}

.cursor-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
}

.cursor-outline {
  width: 40px;
  height: 40px;
  border: 2px solid var(--accent);
  opacity: 0.5;
}

.cursor-outline.hover {
  width: 60px;
  height: 60px;
  opacity: 0.3;
  background: rgba(56, 189, 248, 0.1);
}

@media (max-width: 1024px) {
  .cursor-dot,
  .cursor-outline {
    display: none;
  }

  body.custom-cursor {
    cursor: auto;
  }
}

/* ---------- Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--gradient);
  z-index: 10001;
  transition: width 0.1s linear;
}

/* ---------- Preloader ---------- */
.preloader {
  position: fixed;
  inset: 0;
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.preloader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.preloader-inner {
  text-align: center;
}

.preloader-logo {
  font-family: var(--font-primary);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.preloader-logo span {
  color: var(--accent);
}

.preloader-bar {
  width: 200px;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: 0 auto 16px;
}

.preloader-bar span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--gradient);
  border-radius: var(--radius-full);
  animation: preloaderFill 1.8s ease-in-out forwards;
}

@keyframes preloaderFill {
  to { width: 100%; }
}

.preloader-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ---------- Background Effects ---------- */
#particles-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
}

.bg-blobs {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  animation: blobFloat 20s ease-in-out infinite;
}

.blob-1 {
  width: 500px;
  height: 500px;
  background: #38bdf8;
  top: -10%;
  left: -10%;
}

.blob-2 {
  width: 400px;
  height: 400px;
  background: #6366f1;
  bottom: 10%;
  right: -5%;
  animation-delay: -7s;
}

.blob-3 {
  width: 350px;
  height: 350px;
  background: #a855f7;
  top: 50%;
  left: 40%;
  animation-delay: -14s;
}

@keyframes blobFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -30px) scale(1.05); }
  66% { transform: translate(-30px, 40px) scale(0.95); }
}

/* ---------- Glass Card ---------- */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.glass-card:hover {
  border-color: rgba(56, 189, 248, 0.25);
  box-shadow: var(--shadow), var(--shadow-glow);
}

/* Shine hover effect */
.shine-hover {
  position: relative;
  overflow: hidden;
}

.shine-hover::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.06), transparent);
  transform: skewX(-20deg);
  transition: left 0.6s ease;
  pointer-events: none;
  z-index: 1;
}

.shine-hover:hover::before {
  left: 150%;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-family: var(--font-primary);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(56, 189, 248, 0.45);
}

.btn-outline {
  border: 2px solid var(--accent);
  color: var(--accent);
  background: transparent;
}

.btn-outline:hover {
  background: rgba(56, 189, 248, 0.1);
  transform: translateY(-3px);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.85rem;
}

.btn-full {
  width: 100%;
}

.btn-ripple .ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  transform: scale(0);
  animation: rippleAnim 0.6s ease-out;
  pointer-events: none;
}

@keyframes rippleAnim {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* ---------- Section Header ---------- */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
}

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Navbar ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  height: var(--header-height);
  transition: background var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-family: var(--font-primary);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  z-index: 1002;
}

.nav-logo span {
  color: var(--accent);
}

.nav-menu {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 12px;
  position: relative;
  transition: color var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient);
  border-radius: var(--radius-full);
  transition: width var(--transition), left var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 60%;
  left: 20%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 1002;
}

.theme-toggle {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-size: 1.1rem;
  transition: transform var(--transition), background var(--transition);
}

.theme-toggle:hover {
  transform: rotate(15deg) scale(1.05);
  background: rgba(56, 189, 248, 0.15);
}

[data-theme="dark"] .theme-icon-light,
[data-theme="light"] .theme-icon-dark {
  display: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-close {
  display: none;
  position: absolute;
  top: 24px;
  right: 24px;
  font-size: 1.5rem;
  color: var(--text-primary);
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  position: relative;
  z-index: 1;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-greeting {
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 12px;
  font-weight: 500;
}

.wave {
  display: inline-block;
  animation: wave 2s ease-in-out infinite;
}

@keyframes wave {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(20deg); }
  75% { transform: rotate(-10deg); }
}

.hero-name {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-role {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-family: var(--font-primary);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  min-height: 2em;
}

.typing-cursor {
  color: var(--accent);
  animation: blink 0.8s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-description {
  max-width: 520px;
  margin-bottom: 32px;
  font-size: 1.05rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.hero-social {
  display: flex;
  gap: 16px;
}

.social-link {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-size: 1.2rem;
  transition: transform var(--transition), background var(--transition), color var(--transition), box-shadow var(--transition);
}

.social-link:hover {
  transform: translateY(-4px);
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(56, 189, 248, 0.35);
}

/* Hero Visual */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image-wrapper {
  position: relative;
  width: 100%;
  max-width: 400px;
  aspect-ratio: 1;
}

.hero-glow {
  position: absolute;
  inset: 10%;
  background: var(--gradient);
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.4;
  animation: pulseGlow 4s ease-in-out infinite;
}

@keyframes pulseGlow {
  0%, 100% { opacity: 0.35; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(1.05); }
}

.hero-image-card {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  z-index: 2;
}

.profile-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
}

.profile-placeholder i {
  font-size: 5rem;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.profile-placeholder span {
  font-size: 0.9rem;
  font-weight: 500;
}

.floating-icon {
  position: absolute;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  font-size: 1.5rem;
  color: var(--accent);
  box-shadow: var(--shadow);
  animation: floatIcon 6s ease-in-out infinite;
  z-index: 3;
}

.fi-1 { top: 5%; left: 0; animation-delay: 0s; }
.fi-2 { top: 15%; right: -5%; animation-delay: -1s; }
.fi-3 { bottom: 25%; left: -8%; animation-delay: -2s; }
.fi-4 { bottom: 10%; right: 5%; animation-delay: -3s; }
.fi-5 { top: 45%; right: -10%; animation-delay: -4s; }

@keyframes floatIcon {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 44px;
  border: 2px solid var(--text-muted);
  border-radius: 20px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}

.hero-scroll span {
  width: 4px;
  height: 8px;
  background: var(--accent);
  border-radius: 4px;
  animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
  0% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(16px); }
}

/* ---------- About ---------- */
.about {
  background: var(--bg-secondary);
  z-index: 1;
  position: relative;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.about-text p {
  margin-bottom: 20px;
}

.about-text strong {
  color: var(--accent);
}

.about-text .btn {
  margin-top: 16px;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.stat-card {
  padding: 28px 24px;
  text-align: center;
  transition: transform var(--transition);
}

.stat-card:hover {
  transform: translateY(-8px);
}

.stat-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
  font-size: 1.3rem;
}

.stat-number {
  display: block;
  font-family: var(--font-primary);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ---------- Education Timeline ---------- */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gradient);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  padding-bottom: 40px;
}

.timeline-marker {
  position: absolute;
  left: -40px;
  top: 24px;
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  border: 4px solid var(--bg-primary);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.3);
  animation: markerPulse 2s ease-in-out infinite;
}

@keyframes markerPulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.3); }
  50% { box-shadow: 0 0 0 8px rgba(56, 189, 248, 0.15); }
}

.timeline-content {
  padding: 32px;
}

.edu-card-header {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}

.edu-icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient);
  border-radius: var(--radius-md);
  color: #fff;
  font-size: 1.4rem;
}

.edu-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(56, 189, 248, 0.12);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 8px;
}

.timeline-content h3 {
  font-size: 1.25rem;
  margin-bottom: 4px;
}

.edu-university {
  color: var(--accent);
  font-weight: 600;
}

.edu-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 16px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.edu-meta i {
  margin-right: 6px;
  color: var(--accent);
}

/* ---------- Experience ---------- */
.exp-timeline {
  display: flex;
  flex-direction: column;
  gap: 30px;
  max-width: 900px;
  margin: 0 auto;
}

.exp-card {
  display: flex;
  gap: 24px;
  padding: 32px;
  transition: transform var(--transition);
}

.exp-card:hover {
  transform: translateX(8px);
}

.exp-icon {
  width: 64px;
  height: 64px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(56, 189, 248, 0.12);
  border-radius: var(--radius-md);
  color: var(--accent);
  font-size: 1.5rem;
}

.exp-date {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
}

.exp-content h3 {
  font-size: 1.25rem;
  margin: 8px 0 4px;
}

.exp-company {
  font-weight: 600;
  color: var(--text-primary);
}

.exp-type {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 8px 0 12px;
}

.exp-desc {
  font-size: 0.95rem;
}

/* ---------- Certifications ---------- */
.certifications {
  background: var(--bg-secondary);
  position: relative;
  z-index: 1;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 320px));
  gap: 24px;
  justify-content: center;
}

.cert-card {
  padding: 32px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.cert-card:hover {
  transform: translateY(-10px);
}

.cert-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  background: rgba(56, 189, 248, 0.1);
  border-radius: var(--radius-md);
  color: var(--accent);
}

.cert-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.cert-card > p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.cert-btn {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius-full);
  transition: background var(--transition), color var(--transition);
  position: relative;
  overflow: hidden;
}

.cert-btn:hover {
  background: var(--accent);
  color: #fff;
}

/* ---------- Skills ---------- */
.skills-filter,
.projects-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.filter-btn,
.project-filter-btn {
  padding: 10px 22px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn.active,
.project-filter-btn:hover,
.project-filter-btn.active {
  background: var(--gradient);
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(56, 189, 248, 0.3);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.skill-card {
  padding: 24px;
  transition: transform var(--transition), opacity var(--transition);
}

.skill-card.hidden {
  display: none;
}

.skill-card:hover {
  transform: translateY(-6px) scale(1.02);
}

.skill-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.skill-header i {
  font-size: 1.75rem;
}

.skill-header span {
  font-family: var(--font-primary);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 1rem;
}

.skill-bar {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 8px;
}

.skill-bar span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--gradient);
  border-radius: var(--radius-full);
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.skill-percent {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
}

/* ---------- Services ---------- */
.services {
  background: var(--bg-secondary);
  position: relative;
  z-index: 1;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.service-card {
  padding: 36px 28px;
  text-align: center;
  transition: transform var(--transition);
}

.service-card:hover {
  transform: translateY(-12px);
}

.service-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: #fff;
  background: var(--gradient);
  border-radius: var(--radius-md);
  transition: transform var(--transition);
}

.service-card:hover .service-icon {
  transform: rotateY(180deg);
}

.service-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 0.95rem;
}

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 30px;
}

.project-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card.hidden {
  display: none;
}

.project-card:hover {
  box-shadow: var(--shadow), var(--shadow-glow);
}

.project-image {
  position: relative;
  height: 220px;
  overflow: hidden;
}

.project-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  font-size: 4rem;
  color: var(--accent);
  opacity: 0.6;
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.project-overlay-content {
  display: flex;
  gap: 16px;
}

.project-link {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-full);
  font-size: 1.2rem;
  transform: translateY(20px);
  opacity: 0;
  transition: transform var(--transition), opacity var(--transition);
}

.project-card:hover .project-link {
  transform: translateY(0);
  opacity: 1;
}

.project-card:hover .project-link:nth-child(2) {
  transition-delay: 0.1s;
}

.project-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-body h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.project-body > p {
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.project-tags span {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.project-actions {
  display: flex;
  gap: 12px;
  margin-top: auto;
}

/* Tilt effect applied via JS transform */
.tilt-card {
  transform-style: preserve-3d;
  will-change: transform;
}

/* ---------- Testimonials ---------- */
.testimonials {
  background: var(--bg-secondary);
  position: relative;
  z-index: 1;
}

.testimonial-slider {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.testimonial-track {
  position: relative;
  min-height: 280px;
}

.testimonial-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  pointer-events: none;
}

.testimonial-slide.active {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
  position: relative;
}

.testimonial-card {
  padding: 48px 40px;
  text-align: center;
}

.quote-icon {
  font-size: 2rem;
  color: var(--accent);
  opacity: 0.5;
  margin-bottom: 20px;
}

.testimonial-card p {
  font-size: 1.1rem;
  font-style: italic;
  margin-bottom: 32px;
  line-height: 1.8;
}

.testimonial-author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.author-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.25rem;
}

.testimonial-author h4 {
  font-size: 1rem;
  text-align: left;
}

.testimonial-author span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.testimonial-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-top: 32px;
}

.testimonial-btn {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  font-size: 1rem;
  transition: background var(--transition), transform var(--transition);
}

.testimonial-btn:hover {
  background: var(--accent);
  color: #fff;
  transform: scale(1.1);
}

.testimonial-dots {
  display: flex;
  gap: 10px;
}

.testimonial-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  opacity: 0.4;
  transition: all var(--transition);
  cursor: pointer;
}

.testimonial-dot.active {
  width: 28px;
  border-radius: var(--radius-full);
  background: var(--accent);
  opacity: 1;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
  align-items: start;
}

.contact-card {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 24px;
  margin-bottom: 16px;
  transition: transform var(--transition);
}

.contact-card:hover {
  transform: translateX(8px);
}

.contact-card > i {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(56, 189, 248, 0.12);
  border-radius: var(--radius-md);
  color: var(--accent);
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-card h4 {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  font-weight: 500;
}

.contact-card a,
.contact-card p {
  color: var(--text-primary);
  font-weight: 500;
}

.contact-card a:hover {
  color: var(--accent);
}

.contact-social {
  display: flex;
  gap: 12px;
  margin: 24px 0;
}

.map-placeholder {
  padding: 40px;
  text-align: center;
  color: var(--text-muted);
  margin-top: 16px;
}

.map-placeholder i {
  font-size: 2.5rem;
  color: var(--accent);
  margin-bottom: 12px;
}

.map-placeholder span {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

/* Contact Form */
.contact-form {
  padding: 40px;
}

.form-group {
  position: relative;
  margin-bottom: 28px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 16px 0 8px;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text-primary);
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--glass-border);
  outline: none;
  transition: border-color var(--transition);
  resize: none;
}

.form-group label {
  position: absolute;
  left: 0;
  top: 16px;
  color: var(--text-muted);
  pointer-events: none;
  transition: top var(--transition), font-size var(--transition), color var(--transition);
}

.form-group input:focus,
.form-group input:not(:placeholder-shown),
.form-group textarea:focus,
.form-group textarea:not(:placeholder-shown) {
  border-color: var(--accent);
}

.form-group input:focus + label,
.form-group input:not(:placeholder-shown) + label,
.form-group textarea:focus + label,
.form-group textarea:not(:placeholder-shown) + label {
  top: -4px;
  font-size: 0.75rem;
  color: var(--accent);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: transparent;
}

.form-line {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient);
  transition: width var(--transition);
}

.form-group input:focus ~ .form-line,
.form-group textarea:focus ~ .form-line {
  width: 100%;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--bg-secondary);
  padding: 60px 0 0;
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--glass-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}

.footer-logo {
  font-family: var(--font-primary);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-logo span {
  color: var(--accent);
}

.footer-brand p {
  margin-top: 12px;
  max-width: 280px;
}

.footer-links h4,
.footer-social-wrap h4 {
  font-size: 1rem;
  margin-bottom: 20px;
}

.footer-links ul li {
  margin-bottom: 10px;
}

.footer-links a:hover {
  color: var(--accent);
  padding-left: 4px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  transition: all var(--transition);
}

.footer-social a:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-4px);
}

.footer-bottom {
  padding: 24px 0;
  border-top: 1px solid var(--glass-border);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  background: var(--gradient);
  color: #fff;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.35);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 30px rgba(56, 189, 248, 0.5);
}

/* ---------- Toast Notification ---------- */
.toast {
  position: fixed;
  bottom: 100px;
  right: 32px;
  padding: 16px 24px;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-weight: 500;
  z-index: 10002;
  transform: translateX(120%);
  transition: transform 0.4s ease;
  box-shadow: var(--shadow);
}

.toast.show {
  transform: translateX(0);
}

.toast.success {
  border-left: 4px solid #22c55e;
}

.toast.error {
  border-left: 4px solid #ef4444;
}

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .nav-list {
    gap: 0;
  }

  .nav-link {
    padding: 8px 8px;
    font-size: 0.8rem;
  }
}

@media (max-width: 992px) {
  :root {
    --section-padding: 80px;
  }

  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta,
  .hero-social {
    justify-content: center;
  }

  .hero-visual {
    order: -1;
  }

  .hero-image-wrapper {
    max-width: 300px;
    margin: 0 auto;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 85%;
    max-width: 360px;
    height: 100vh;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 100px 32px 40px;
    transition: right var(--transition);
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.2);
    z-index: 1001;
  }

  .nav-menu.show {
    right: 0;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 8px;
  }

  .nav-link {
    font-size: 1rem;
    padding: 12px 0;
    width: 100%;
  }

  .nav-link::after {
    left: 0;
    bottom: 8px;
  }

  .nav-link:hover::after,
  .nav-link.active::after {
    width: 40px;
    left: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-close {
    display: block;
  }

  .cert-grid {
    grid-template-columns: 1fr;
  }

  .about-stats {
    grid-template-columns: 1fr;
  }

  .exp-card {
    flex-direction: column;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-brand p {
    margin-left: auto;
    margin-right: auto;
  }

  .footer-social {
    justify-content: center;
  }

  .testimonial-card {
    padding: 32px 24px;
  }

  .back-to-top {
    bottom: 24px;
    right: 24px;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta .btn {
    width: 100%;
  }

  .projects-grid,
  .skills-grid {
    grid-template-columns: 1fr;
  }

  .contact-form {
    padding: 28px 20px;
  }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}